Flowing north from Gernika, the Río Oka broadens into an estuary that’s fringed by hilly pinewoods and dotted with islets. A succession of sandy coves offer great swimming, but the best spots are at Sukarrieta and especially MUNDAKA. This lovely little village remains amazingly unspoiled, despite having achieved legendary status for its magnificent surfing, which includes what’s claimed to be the longest left break in the world. Although Mundaka has frequently hosted world championship events, conditions tend to vary considerably from year to year. In good years, during the peak winter season, it’s often possible to watch the surfers battle its trademark “Wave” from the plaza next to the church.